In this paper we consider a different approach, employing the concept of single operator dominance (cf. [1]}, [2]}) where each Yukawa entry is dominated by a different single GUT operator.The concept of single operator dominance has so far mainly been studied in the context of SUSY GUTs, cf. e.g. [3]}, [4]}, [5]}, [6]}, [7]}, but is rarely considered in the context of non-SUSY GUTs.
These GUT operators may be renormalizable or non-renormalizable, and allow to consider different GUT scale ratios between different entries of the lepton and down-type quark Yukawa matrices. This way a high predictivity with respect to fermion masses can be maintained, but alternative GUT scale rations between charged lepton and down-type quark Yukawa couplings can be realized that are potentially more promising w.r.t. the experimental data. As we will argue below, the ratios
\(y_\tau /y_b=3/2 \quad \mbox{and} \quad y_\mu /y_s=9/2\) 
